Gnuplot: How to plot a 2d colorplot of a 3d function

[DerBaer]

Hello,

I have a data file created by an C++ Programm which creates the lines of the data file by an operation inside an loop

data3dRnd << gsl_vector_get(x,0) << '    ' << gsl_vector_get(x,1) << '    ' << my_f(x,par) << endl << endl;

where the entries of the gsl_vector x are doubles and my_f(x,par) is a double depending on x.

I would like to produce a colour plot with x1 and x2 on the axes and show my_f(x,par) via the color of plot. There are some points x where my_f(x,par) produces an Ignore value (1e+300 in this case) and I don't want data points to be plotted which lead to my_f = Ignore value.
In a 2D plot of my_f over sqrt(x1^2+x2^2) I achieve this with

 using 1:($2 < 1e+300 ? $2 : 1/0)

How can I achieve this? At first there was only one << endl in my code, but that gave me the error that i need more then one Isoline. So I entered the second << endl as the Isolines are sperated by a blank line.

My current Gnuplot Scrit is

set terminal eps enhancedset output "VEffCont.eps"
set view map
set isosamples 100, 100
unset surface
set style data pm3d
set style function pm3d
set ticslevel 0
set title "Random v1 - v2 - Distribution"
set xlabel "v1 [GeV]"
set ylabel "v2 [GeV]"
set pm3d implicit at b
set palette cubehelix
splot "./3dRnd.dat" u 1:2:3 w pm3d

This produces a grid with the correct ranges of x and y axes and a colour scale for my_f but with nothing in the plot window as shown in the attached pdf.

Thanks in advance.

 

[Dr. Courtney]

These commands:set pm3d explicit at b
set pm3d scansautomatic
set pm3d interpolate 1,1 flush begin noftriangles nohidden3d corners2color mean
set palette positive nops_allcF maxcolors 0 gamma 1.5 color model RGB
set palette rgbformulae 7, 5, 15
set colorbox default
set colorbox vertical origin screen 0.9, 0.2, 0 size screen 0.05, 0.6, 0 front bdefault
set loadpath
set fontpath
set fit noerrorvariables
GNUTERM = "wxt"
set title "29aprd1 Spectrogram"
se zra [-5:5]
splot "29aprd1.tfm" using ($3+ 0.01):1:(log10($2))
set out "29aprd1tfm.png"
set term png transparent truecolor enhanced
rep
set out
set term wxt
# EOFProduced the output in Figure 3 here: http://www.btgresearch.org/AcousticReconstruction02042012.pdf

 

[DerBaer]

Thanks Dr. Courtney,

A Member on the Gnuplot Google Help Group suggested this

set dgrid3d # create a regularized grid from your "data"
set view map # 2D projection
splot dataf us 1:2:($3<1e299?$3:NaN) w pm3d # z-coloured

and this worked quite fine for my dataset.